<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>boxshadow</title>
<style>
.boxshadow-outset{
    width:100px;
	height:100px;
    box-shadow:4px 4px 6px #666;
}
.boxshadow-inset{
    width:100px;
    height:100px;
    box-shadow:4px 4px 6px #666 inset;
}
.boxshadow-multi{
    width:100px;
    height:100px;
    box-shadow:4px 2px 6px #f00, -4px -2px 6px #000, 0px 0px 12px 5px #33CC00 inset;
}

</style>
</head>

<body>
<h2>外阴影</h2>
<div class="boxshadow-outset">
</div>
<br />
<h2>内阴影</h2>
<div class="boxshadow-inset">
</div>
<br />
<h2>多阴影</h2>
<div class="boxshadow-multi">
</div>
</body>CSS3边框
</html>